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Bug#496746: pubkey auth non-functional on testing?

Hi,


Colin Watson schrieb:

Please use -vvv when reporting bugs. The lower the debug level, the
larger the responsible region of code tends to be. In this case I need a
bit more in order to help.


liske@ijon:~$ slogin -vvv localhost
OpenSSH_5.1p1 Debian-2, OpenSSL 0.9.8g 19 Oct 2007
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to localhost [127.0.0.1] port 22.
debug1: Connection established.
debug1: identity file /home/liske/.ssh/identity type -1
debug1: identity file /home/liske/.ssh/id_rsa type -1
debug3: Not a RSA1 key file /home/liske/.ssh/id_dsa.
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: missing keytype
debug2: key_type_from_name: unknown key type 'Proc-Type:'
debug3: key_read: missing keytype
debug2: key_type_from_name: unknown key type 'DEK-Info:'
debug3: key_read: missing keytype
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: missing keytype
debug1: identity file /home/liske/.ssh/id_dsa type 2
debug1: Checking blacklist file /usr/share/ssh/blacklist.DSA-1024
debug1: Checking blacklist file /etc/ssh/blacklist.DSA-1024
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.1p1 Debian-2 
debug1: match: OpenSSH_5.1p1 Debian-2 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.1p1 Debian-2
debug2: fd 3 setting O_NONBLOCK
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96 
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 
debug2: kex_parse_kexinit: ssh-rsa
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96 
debug2: kex_parse_kexinit: none,zlib@openssh.com
debug2: kex_parse_kexinit: none,zlib@openssh.com
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: mac_setup: found hmac-md5
debug1: kex: server->client aes128-cbc hmac-md5 none
debug2: mac_setup: found hmac-md5
debug1: kex: client->server aes128-cbc hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug2: dh_gen_key: priv key bits set: 127/256
debug2: bits set: 530/1024
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug3: check_host_in_hostfile: filename /home/liske/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 48
debug1: Host 'localhost' is known and matches the RSA host key.
debug1: Found key in /home/liske/.ssh/known_hosts:48
debug2: bits set: 508/1024
debug1: ssh_rsa_verify: signature correct
debug2: kex_derive_keys
debug2: set_newkeys: mode 1
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug2: set_newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /home/liske/.ssh/id_dsa (0x80065008)
debug2: key: /home/liske/.ssh/identity ((nil))
debug2: key: /home/liske/.ssh/id_rsa ((nil))
debug1: Authentications that can continue: publickey,password
debug3: start over, passed a different list publickey,password
debug3: preferred gssapi-keyex,gssapi-with-mic,gssapi,publickey,keyboard-interactive,password 
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering public key: /home/liske/.ssh/id_dsa
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
debug1: Server accepts key: pkalg ssh-dss blen 434
debug2: input_userauth_pk_ok: fp xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx 
debug3: sign_and_send_pubkey

(fp was cleared by me)



While you say it seems to be a client issue, my gut response here would
be a server issue, all other things being equal. Have you checked
/var/log/auth.log on the server? It might be worth starting up a server
on a temporary port with the -ddd option to get detailed debugging from
it.


Find the detailed log of sshd attached. auth.log says nothing.


FWIW I use public key authentication all the time, including to a Debian
stable host, and it's working fine for me.
From other (stable) machines everything works fine (even with my keyfile)... I have no glue what is happening here. 


Regards,
Thomas Liske

debug2: load_server_config: filename /etc/ssh/sshd_config
debug2: load_server_config: done config len = 605
debug2: parse_server_config: config /etc/ssh/sshd_config len 605
debug3: /etc/ssh/sshd_config:5 setting Port 22
debug3: /etc/ssh/sshd_config:9 setting Protocol 2
debug3: /etc/ssh/sshd_config:11 setting HostKey /etc/ssh/ssh_host_rsa_key
debug3: /etc/ssh/sshd_config:14 setting UsePrivilegeSeparation yes
debug3: /etc/ssh/sshd_config:17 setting KeyRegenerationInterval 3600
debug3: /etc/ssh/sshd_config:18 setting ServerKeyBits 768
debug3: /etc/ssh/sshd_config:21 setting SyslogFacility AUTH
debug3: /etc/ssh/sshd_config:22 setting LogLevel INFO
debug3: /etc/ssh/sshd_config:25 setting LoginGraceTime 120
debug3: /etc/ssh/sshd_config:26 setting PermitRootLogin yes
debug3: /etc/ssh/sshd_config:27 setting StrictModes yes
debug3: /etc/ssh/sshd_config:29 setting RSAAuthentication yes
debug3: /etc/ssh/sshd_config:30 setting PubkeyAuthentication yes
debug3: /etc/ssh/sshd_config:34 setting IgnoreRhosts yes
debug3: /etc/ssh/sshd_config:36 setting RhostsRSAAuthentication no
debug3: /etc/ssh/sshd_config:38 setting HostbasedAuthentication no
debug3: /etc/ssh/sshd_config:43 setting PermitEmptyPasswords no
debug3: /etc/ssh/sshd_config:47 setting ChallengeResponseAuthentication no
debug3: /etc/ssh/sshd_config:62 setting X11Forwarding yes
debug3: /etc/ssh/sshd_config:63 setting X11DisplayOffset 10
debug3: /etc/ssh/sshd_config:64 setting PrintMotd no
debug3: /etc/ssh/sshd_config:65 setting PrintLastLog yes
debug3: /etc/ssh/sshd_config:66 setting TCPKeepAlive yes
debug3: /etc/ssh/sshd_config:73 setting AcceptEnv LANG LC_*
debug3: /etc/ssh/sshd_config:75 setting Subsystem sftp /usr/lib/openssh/sftp-server
debug3: /etc/ssh/sshd_config:77 setting UsePAM yes
debug1: sshd version OpenSSH_5.1p1 Debian-2
debug3: Not a RSA1 key file /etc/ssh/ssh_host_rsa_key.
debug1: read PEM private key done: type RSA
debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048
debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048
debug1: private host key: #0 type 1 RSA
debug1: rexec_argv[0]='/usr/sbin/sshd'
debug1: rexec_argv[1]='-p'
debug1: rexec_argv[2]='2222'
debug1: rexec_argv[3]='-ddd'
debug2: fd 3 setting O_NONBLOCK
debug1: Bind to port 2222 on ::.
Server listening on :: port 2222.
debug2: fd 4 setting O_NONBLOCK
debug1: Bind to port 2222 on 0.0.0.0.
Server listening on 0.0.0.0 port 2222.
debug3: fd 5 is not O_NONBLOCK
debug1: Server will not fork when running in debugging mode.
debug3: send_rexec_state: entering fd = 8 config len 605
debug3: ssh_msg_send: type 0
debug3: send_rexec_state: done
debug1: rexec start in 5 out 5 newsock 5 pipe -1 sock 8
debug1: inetd sockets after dupping: 3, 3
Connection from 127.0.0.1 port 35863
debug1: Client protocol version 2.0; client software version OpenSSH_5.1p1 Debian-2
debug1: match: OpenSSH_5.1p1 Debian-2 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.1p1 Debian-2
debug2: fd 3 setting O_NONBLOCK
debug3: privsep user:group 108:65534
debug1: permanently_set_uid: 108/65534
debug1: list_hostkey_types: ssh-rsa
debug1: SSH2_MSG_KEXINIT sent
debug2: Network child is on pid 13577
debug3: preauth child monitor started
debug3: mm_request_receive entering
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib@openssh.com
debug2: kex_parse_kexinit: none,zlib@openssh.com
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: first_kex_follows 0 
debug2: kex_parse_kexinit: reserved 0 
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: first_kex_follows 0 
debug2: kex_parse_kexinit: reserved 0 
debug2: mac_setup: found hmac-md5
debug1: kex: client->server aes128-cbc hmac-md5 none
debug2: mac_setup: found hmac-md5
debug1: kex: server->client aes128-cbc hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST received
debug3: mm_request_send entering: type 0
debug3: mm_choose_dh: waiting for MONITOR_ANS_MODULI
debug3: monitor_read: checking request 0
debug3: mm_request_receive entering
debug3: mm_answer_moduli: got parameters: 1024 1024 8192
debug3: mm_request_send entering: type 1
debug2: monitor_read: 0 used once, disabling now
debug3: mm_request_receive entering
debug3: mm_choose_dh: remaining 0
debug1: SSH2_MSG_KEX_DH_GEX_GROUP sent
debug2: dh_gen_key: priv key bits set: 130/256
debug2: bits set: 508/1024
debug1: expecting SSH2_MSG_KEX_DH_GEX_INIT
debug2: bits set: 507/1024
debug3: mm_key_sign entering
debug3: mm_request_send entering: type 5
debug3: mm_key_sign: waiting for MONITOR_ANS_SIGN
debug3: mm_request_receive_expect entering: type 6
debug3: mm_request_receive entering
debug3: monitor_read: checking request 5
debug3: mm_answer_sign
debug3: mm_answer_sign: signature 0x80076980(271)
debug3: mm_request_send entering: type 6
debug2: monitor_read: 5 used once, disabling now
debug3: mm_request_receive entering
debug1: SSH2_MSG_KEX_DH_GEX_REPLY sent
debug2: kex_derive_keys
debug2: set_newkeys: mode 1
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug2: set_newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: KEX done
debug1: userauth-request for user liske service ssh-connection method none
debug1: attempt 0 failures 0
debug3: mm_getpwnamallow entering
debug3: mm_request_send entering: type 7
debug3: mm_getpwnamallow: waiting for MONITOR_ANS_PWNAM
debug3: monitor_read: checking request 7
debug3: mm_request_receive entering
debug3: mm_answer_pwnamallow
debug3: Trying to reverse map address 127.0.0.1.
debug2: parse_server_config: config reprocess config len 605
debug3: mm_answer_pwnamallow: sending MONITOR_ANS_PWNAM: 1
debug3: mm_request_send entering: type 8
debug2: monitor_read: 7 used once, disabling now
debug3: mm_request_receive entering
debug2: input_userauth_request: setting up authctxt for liske
debug3: mm_start_pam entering
debug3: mm_request_send entering: type 48
debug3: mm_inform_authserv entering
debug1: PAM: initializing for "liske"
debug3: mm_request_send entering: type 3
debug2: input_userauth_request: try method none
debug3: mm_auth_password entering
debug3: mm_request_send entering: type 11
debug3: mm_auth_password: waiting for MONITOR_ANS_AUTHPASSWORD
debug3: mm_request_receive_expect entering: type 12
debug3: mm_request_receive entering
debug1: PAM: setting PAM_RHOST to "localhost"
debug1: PAM: setting PAM_TTY to "ssh"
debug2: monitor_read: 48 used once, disabling now
debug3: mm_request_receive entering
debug3: monitor_read: checking request 3
debug3: mm_answer_authserv: service=ssh-connection, style=, role=
debug2: monitor_read: 3 used once, disabling now
debug3: mm_request_receive entering
debug3: monitor_read: checking request 11
debug3: mm_answer_authpassword: sending result 0
debug3: mm_request_send entering: type 12
Failed none for liske from 127.0.0.1 port 35863 ssh2
debug3: mm_request_receive entering
debug1: userauth-request for user liske service ssh-connection method publickey
debug1: attempt 1 failures 0
debug2: input_userauth_request: try method publickey
debug1: test whether pkalg/pkblob are acceptable
debug3: mm_key_allowed entering
debug3: mm_request_send entering: type 21
debug3: mm_key_allowed: waiting for MONITOR_ANS_KEYALLOWED
debug3: mm_request_receive_expect entering: type 22
debug3: mm_answer_keyallowed entering
debug3: mm_request_receive entering
debug3: mm_answer_keyallowed: key_from_blob: 0x80081c68
debug1: Checking blacklist file /usr/share/ssh/blacklist.DSA-1024
debug1: Checking blacklist file /etc/ssh/blacklist.DSA-1024
debug1: temporarily_use_uid: 1045/100 (e=0/0)
debug1: trying public key file /home/liske/.ssh/authorized_keys
debug1: restore_uid: 0/0
debug1: temporarily_use_uid: 1045/100 (e=0/0)
debug1: trying public key file /home/liske/.ssh/authorized_keys2
debug1: fd 4 clearing O_NONBLOCK
debug3: secure_filename: checking '/home/liske/.ssh'
debug3: secure_filename: checking '/home/liske'
debug3: secure_filename: terminating check at '/home/liske'
debug1: matching key found: file /home/liske/.ssh/authorized_keys2, line 1
Found matching DSA key: xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx
debug1: restore_uid: 0/0
debug3: mm_answer_keyallowed: key 0x80081c68 is allowed
debug3: mm_request_send entering: type 22
debug3: mm_request_receive entering
debug2: userauth_pubkey: authenticated 0 pkalg ssh-dss
Postponed publickey for liske from 127.0.0.1 port 35863 ssh2
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